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Aqueous coating composition

a technology of coating composition and water, applied in the direction of pretreatment surface, textiles and paper, synthetic resin layered products, etc., can solve the problems of affecting the appearance of the composition, the effect of preventing or suppressing the change of color of the composition during storag

Active Publication Date: 2009-10-08
KANSAI PAINT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0031]The aqueous coating composition of the present invention contains the film-forming aqueous resin (A1), the dioxazine pigment (B), the hydrophobic solvent (C) and the resin (D) having an aromatic ring with a nitro group bonded thereto, whereby the coating composition has excellent storage stability such that a change in the color of the composition during storage is prevented or suppressed; and the composition can form a coating film with an excellent appearance such that popping is prevented or suppressed.

Problems solved by technology

However, when a temperature abruptly rises during the heating and curing process, a phenomenon called “popping” is generally known to occur on the cured coated film formed from such an aqueous heat-curable coating composition.
However, the main component of the solvent of the aqueous coating composition is water, and the amount of organic solvent having a relatively high boiling point is limited.
Therefore, popping is more likely to occur in the aqueous solution than in a solvent-type coating composition.
However, when the above-mentioned aqueous coating composition containing the hydrophobic solvent uses the dioxazine pigment as a coloring pigment, it has problematic color variation during the storage of the coating composition.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0248]128 parts of deionized water and 2 parts of “Adekaria Soap SR-1025 (tradename, Adeka, emulsifier, active ingredient: 25%) were placed into a reaction vessel equipped with a thermometer, thermostat, stirrer, reflux condenser, nitrogen inlet tube and dropper. The mixture was stirred and mixed under a nitrogen stream and heated to 80° C.

[0249]A 1% portion of the total amount of monomer emulsion for a core copolymer described below and 5.3 parts of a 6% aqueous solution of ammonium persulfate were then introduced into the reaction vessel and the mixture was maintained at 80° C. for 15 minutes. The remainder of the monomer emulsion for the core copolymer was then added dropwise into the reaction vessel maintained at the same temperature, over a period of 3 hours. After the completion of the addition, the mixture was aged for 1 hour. A monomer emulsion for a shell copolymer described below was added dropwise over 1 hour, and the mixture was aged for 1 hour. While 40 parts of a 5% aq...

preparation examples 2 to 5

[0252]Water-dispersible hydroxy-containing acrylic resin dispersions (A1-1-2) to (A1-1-5) were obtained in a manner similar to that in Preparation Example 1 except that the starting materials and proportions thereof shown in Table 1 below were used.

[0253]Table 1 shows the starting material proportions (parts), solids content (%), acid values (mg KOH / g), and hydroxy values (mg KOH / g) of the aqueous dispersions of the water-dispersible hydroxy-containing acrylic resins (A1-1-1) to (A1-1-5).

[0254]In Table 1, methylene bisacrylamide and allyl methacrylate in the monomer emulsion for the core copolymer are polymerizable unsaturated monomers having two or more polymerizable unsaturated groups per molecule. Styrene and 2-ethylhexyl acrylate in the monomer emulsion for the shell copolymer are hydrophobic polymerizable unsaturated monomers.

TABLE 1Preparation Example12345Name of water-dispersibleA1-1-1A1-1-2A1-1-3A1-1-4A1-1-5hydroxy-containing acrylicresinDeionized water128128128128128“Adekar...

preparation example 6

[0256]Thirty-five parts of propylene glycol monopropyl ether was placed into a reaction vessel equipped with a thermometer, thermostat, stirrer, reflux condenser, nitrogen inlet tube and dropper, and heated to 85° C. A mixture of 30 parts of methyl methacrylate, 20 parts of 2-ethylhexyl acrylate, 29 parts of n-butyl acrylate, 15 parts of 2-hydroxyethyl acrylate, 6 parts of acrylic acid, 15 parts of propylene glycol monopropyl ether and 2.3 parts of 2,2′-azobis(2,4-dimethylvaleronitrile) was added dropwise over a period of 4 hours. After completion of the addition, the mixture was aged for 1 hour. A mixture of 10 parts of propylene glycol monopropyl ether and 1 part of 2,2′-azobis(2,4-dimethylvaleronitrile) was added dropwise over a period of 1 hour. After completion of the addition, the mixture was aged for 1 hour. Subsequently, 7.4 parts of diethanolamine was added, producing a hydroxy-containing acrylic resin solution (A1-1-6) with a solids content of 55%. The obtained hydroxy-con...

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Abstract

The present invention provides an aqueous coating composition that can form a coated film having excellent appearance, in which a change in the color of the coating composition during the storage of the coating composition is prevented or suppressed, excellent storage stability is provided, and the generation of popping is prevented or suppressed; and a method for forming a coated film. The aqueous coating composition contains (A1) a film-forming aqueous resin, (B) a dioxazine pigment, (C) a hydrophobic solvent and (D) a resin having an aromatic ring with a nitro group bonded thereto, and a method for forming a coated film using the composition.

Description

TECHNICAL FIELD[0001]The present invention relates to an aqueous coating composition and a method for forming a coated film using the aqueous coating composition.BACKGROUND ART[0002]Painting the bodies of automobiles is generally conducted by applying an electrodeposition coating composition as a primer coating composition, applying an intermediate coat, and then applying a topcoat coating composition.[0003]Examples of methods of applying the topcoat coating composition include a one-coat one-bake method, in which one kind of topcoat coating composition is applied and cured with heating; a two-coat one-bake method, in which two kinds of topcoat coating compositions (a base coating composition and a clear coating composition) are used, first by applying the base coating composition, then applying the clear coating composition on top of the uncured coating composition, and simultaneously curing the two coated films with heating; etc. Among these, in the application by the two-coat one...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C08K5/35B05D3/02
CPCC09D133/066C08L2666/02Y10T428/31855C09D133/00C09D167/00C09D167/02C09D201/025
Inventor YUKAWA, YOSHIYUKIONO, TAKAYUKI
Owner KANSAI PAINT CO LTD
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